| 末次冰期贵州七星洞石笋高分辨率气候记录与Heinrich事件 |
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| 关键词:stalagmite oxygen isotope record Dansgaard-Oeschger cycles Heinrich events Qinxing cave of southern Guizhou |
| 基金项目:科学技术部项目“中国洞穴石笋样品保护库的建造”(编号:2003DEB6J069)，国家自然科学基金项目(编号:40231008) |
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| The High Resolution Climate Records from Two Stalagmites in Qixing Cave of Guizhou and the Heinrich Events of the Last Glacial Period |
| The time sequence of high resolution paleo-climatic change since the last glacial period-60.5 ka B P-was reconstructed by means of high precision TIMS-U series dating and oxygen isotope analysis of Q4 and Q6 stalagmites from Qxing cave in southern Guizhou. Through a comparative analysis of δ 18 O curves between the GISP2 ice core and two (Q4 and Q6 ) stalagmites from Qixing cave, the depositional records of the Dansgaard-Oeschger cycle events 1～18 and Heinrich events H1—H5 from the records of two stalagmites in southern Guizhou which can reflect rapid climate change in short time scale since the last glacial stage were preliminarily revealed and discussed, and the ages of the cold events were determined. The results have shown that the records of the cold and warm events from two stalagmites since 60.50 ka B P in southern Guizhou are reflections of the paleo-monsoon circulation changes, and that these changes are clearly affected by the climate oscillation of the North Atlantic Ocean. This suggests that they are obviously related to the paleo-climate changes in the North pole region. The records of δ 18 O from the Q4 and Q6 stalagmites indicate that theδ18O values from 60.59 ka B P to 11.29 ka B P changed from somewhat negative to relatively positive in the last glacial period, and suggest that the Asian summer monsoon gradually weakened and the climate tended to become drier and cooler. |
| ZHANG Mei-liang,CHENG Hai,YUAN Dao-xian,LIN Yu-shi,QIN Jia-ming,ZHANG Cheng.2004.The High Resolution Climate Records from Two Stalagmites in Qixing Cave of Guizhou and the Heinrich Events of the Last Glacial Period[J].Acta Geoscientica Sinica,25(3):337-344. |
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